Grizzly

Ok i want to set up the Tps on my 1990 T2, I have removed the plug and there are 6 terminals (6 wires) going to 2 switches wich two wires should be used to set it up? its just i think mine is playing up as none of them are anywhere near 1 ohm?

Any Idears? or a clear Picture would be nice, you can't see what colours they are using?

Thanks

Josepi

Ok, lets try a different method to get it to spec.
Warm up the car to full operating temperature, cut off, remove intercooloer.

1. Find and Identify. There are 2 plungers for the TPS. The one towards the front of the engine bay is the low range plunger. See it? Good, now onto step two.

2. Grab your voltmeter and set it to 20 DCv (NOT DCmv-millivolts, that'll fry your tester...I just know ). Find a suitable ground and make sure the ground is good by testing something (your battery for example). Now that you have established that your ground is good for testing, step 3.

3. Find the plug for the TPS. It has 6 wires.

4. Near the battery there is a single wire with a green connector. Now take a good 10" piece of wire, and make a connection between the green connector and the - terminal of the battery, making sure that both ends are secure. Now go into the car and turn the key till the warning lights come on, making sure NOT to start the car.

5. Remember step 3? You should, it was only 2 steps ago . The 6 wires are actually what is used by the ECU to determine throttle position. Each plunger uses 3 wires each. For each plunger there is:

-0.0v Ground
-5.0v Power supply
-?.?v Data line

The data line for the plunger described in step 1 is the one you will be adjusting to 1.0v. Keep the TPS connected and CRAM the tester's leads into the plug (side of the plug that goes to the TPS is easier). Test each one till you identify the two wires that are NOT 0.0v, or 5.0v. Now you should be left with 2 wires that have different voltages.

6. Identifying which one is the left (low range) plunger is really easy. Just move the plunger around with your finger and see if the voltage jumps. If it doesn't jump, try the other wire that has the odd # voltage (not 0 or 5).

7. Don't be amazed if it is off, mine was at 2.8 when I tested it. To adjust the voltage, put a 8mm wrench on the back of the adjusting screw and turn with a flathead until you reach 1.0v. The screw is immediatly to the left of the plunger, kinda behind the altenator. Each turn will make a pretty big change, so adjust slowly. When you get it to 1.00v, play with the throttle cable a lil bit, just to make sure that it settles back to 1.00v even. I had to do this a few times...I gave up with 1.01v (that's REAAALLY close enough for me ).

Good luck,

Joe

Josepi

Kriky! Your in the UK. I assume you already found the TPS, so ignore my locations as far as drivers side of the car and all . Left hand drive or right hand drive?

Grizzly

Yeh but the Engine lay out is the same just the Wheels on the other side. LOL

Thanks for the help its hard to find in the UK (no one wants to know Rx's)

RETed

That's close.
The TPS is actually two TPS' in one unit.&nbsp Each individual TPS uses three wires:
1) ground
2) +5VDC (power supply)
3) signal (output back to ECU)




-Ted

Grizzly

Is'nt that what Joe said?

rotorhead1

hey joe... is that principle sound for a 91 NA as well? I know the TPS units are different from TII to NA. Mine is giving me some trouble, and Mazda wants $350 for a new one.